Multi-graded quartz sand filters, activated carbon / anthracite filters, iron removal filters, bag filters, micron cartridge filters, vent filters with choice of moc of ss, ms, pp, etc. For removal of sediments, suspended solids, organics, cod, bod, color, smell, odour, etc. Ideal for treatment of ground, river, surface, effluent, waste water. Eg. Stp, etp, etc